參數(shù)資料
型號： MC68HC705L16CFU
廠商： FREESCALE SEMICONDUCTOR INC
元件分類： 微控制器/微處理器
英文描述： 8-BIT, OTPROM, 2.1 MHz, MICROCONTROLLER, PQFP80
封裝： PLASTIC, QFP-80
文件頁數(shù)： 105/146頁
文件大小： 852K
代理商： MC68HC705L16CFU
OSC and XOSC
MC68HC05L16 MC68HC705L16 Data Sheet, Rev. 4.1
Freescale Semiconductor
61
Figure 7-2. OSC1, OSC2, XOSC1, and XOSC2 Mask Options
7.4.2 XOSC on Line
If XOSC is the system clock (SYS:SYS1 = 1:1), OSC can be stopped either by the STOP instruction or
by clearing the FOSCE bit.
The suboscillator (XOSC) never stops except during power down. This clock also may be used as the
clock source of the system clock and timebase. STUP bit indicates that the XOSC clock is available.
OSC and XOSC pins have options for feedback and damping resistor implementations. These options
are set through mask option and may be read through the MOSR register.
NOTE
When XOSC is not used, the XOSC1 input pin should be connected to the
RESET pin.
Figure 7-3. Unused XOSC1 Pin
7.4.2.1 XOSC with FOSCE = 1
If the system clock is XOSC and FOSCE = 1, executing the STOP instruction will halt OSC, put the MCU
into a low-power mode and clear the 6-bit POR counter. The 7-bit divider is not initialized. Exiting STOP
with external IRQ re-starts the oscillator; however, execution begins immediately using XOSC. When the
POR counter overflows, FTUP is set, signaling that OSC is stable and OSC can be used as the system
clock. The stabilization time will vary between 8064 and 8192 counts.
Rf
Rd
XOSC1
XOSC2
XOSC
OSC1
OSC2
OSC
MASK
OPTION
MASK
OPTION
ON CHIP
OFF CHIP
XOSC1
XOSC2
XOSC
RESET LOGIC
ON CHIP
OFF CHIP
NO CONNECT
RESET
FROM EXTERNAL RESET CIRCUIT
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